Prepare Carrier Route Bound Printed Matter (BPM) bundles and label under 365.6.0 for flats and 465.6.0 for parcels. Prepare and label Presorted BPM bundles in the sequence and to the destinations required for sacks in 365.5.0 for flats and 465.5.0 for parcels. Prepare a bundle when there are 10 or more pieces or 10 or more pounds, whichever comes first, for the same presort destination within an individual mailing (Carrier Route or Presorted). Bundles are not subject to a specific thickness limit. It is, however, recommended that bundles not exceed 8 inches in height.

Each physical bundle must contain at least 2 addressed pieces. The maximum bundle size is 20 pounds, except as provided in 705.8.9.5. When there are at least 10 pieces but fewer than 10 pounds for a presort destination, the pieces must be prepared in a single physical bundle. When there are 10 or more pounds for a destination, pieces must be prepared in bundles weighing from 10 to 20 pounds each except that the last bundle may weigh less than 10 pounds or contain fewer than 10 pieces (but never fewer than 2 pieces) and mailers should balance the mail in bundles as follows:

General: Although mailers may prepare single mailings on pallets (e.g., only Carrier Route or only Presorted), we have shown co-palletized mailings (commingled rate levels) because this is the most common mailer practice.